Colorful gtx1060-3gd5 graphics card startup screen does not light repair

Colorful gtx1060-3gd5 graphics card startup screen does not light repair

Graphics card model: Colorful gtx1060-3gd5  video game version

Fault phenomenon: the boot screen does not light up

Maintenance process:

A Colorful gtx1060-3gd5 video game version of the card, the fault is boot does not display.Take apart the appearance inspection and find the problem.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 1.

Next to Q576 is 1p, which is NPNtriodeOn the left is the Switch pipe matched with it. It is uncertain that it is n-channel NPN MOSFETnotebookTry removing an n-channel MOSFET from the motherboard. Find an N-channel MOSFET-K72 in Xinzhizao Soft drawing and replace it with the graphics card.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 2.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 3.

Power-on measurement, the core VCC and video memory VCC are not available, and 1.8 is not available, only 3.3 and 5 V.

VCC distribution map:

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 4.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 5.

Turn it over to measure VCC of MOSFET and find the problem.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 6.

Only 1.1V of the control pole is not enough to turn on the N channel, so this should be an NPN transistor.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 7.

Hand painted schematic.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 8.

Find an NPN transistor on the motherboard and replace it.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 9.

After processing, the boot test,Normally booting up, shows that it is normal.

Colorful gtx1060-3gd5 graphics card startup screen does not light repair Figure 10.